JEF meeting, October 22, 2021

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Meeting time and location= 9:30 am EST (JLab time) Bluejeans only

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  • SICCAS crystals
- Meeting with SICCAS
  • Module fabrication
- Beam test of the fabricated modules using PS setup -- Sasha
  • COMCAL tests, TAC running, etc.
  • Data analysis
  • Simulations
- Photon Classification Update -- Azizah


Attendees: Igal,Sasha,Liping,Jon,Jane,Arshak,Zisis,Azizah,Olga,Igor,Susan,S.T.

  • We went over an update from Hui at SICCAS regarding their status
    • Some progress regarding raw material has been made; will follow up in a month
    • Still need to meet with Eugene and the lab management
    • Still considering arranging to use 460 SICCAS crystals from Hall C (originally for NPS)
  • Want to resume module construction in December after end of SRC experiment on Dec 6
    • Still looking at getting support from the detector support group
    • Due to concerns about broken straps with nominal 25 micron thickness, we opted to switch to 50 micron thick straps
      • Vendor has been identified
      • Can safely apply larger torque needed to apply appropriate pressure for silicon cookies
    • All 1600 brash flanges needed for full insert set are in house
  • Sasha showed results of beam studies of a set of 12 crystals using one of the arms of the Pair Spectrometer setup in Hall D
    • All 12 modules were operational
    • Saw ~2.5% energy resolution
  • Azizah gave an update on using TMVA for separating hadronic split-offs from neutral showers
    • Training on ω→π+π-π0 events with charged tracks and neutrals separated into 2 sets
    • Cut on energy in BCAL has no impact on results
    • Dropped some timing info due to how the training was set up
    • Shower shape asymmetry variable and E1/E9 ratio vary useful for distinguishing split-offs from true neutral showers
    • Tried several different MVA algorithms -- so far BDT looks the best
    • Has not checked for over-training yet; Igal also suggested looking into hyperparameters
    • Result from previous TMVA training done by Rebecca (IU) is available as "shower quality factor" in the analysis